\\[-1.8ex] Soil Heterogeneity & $-$2.826$^{***}$ & $-$0.047$^{**}$ & $-$0.516$^{**}$ & $-$0.425$^{***}$ & $-$0.084$^{***}$ & $-$0.033$^{*}$ & $-$0.252 \\ 
  & (0.819) & (0.022) & (0.202) & (0.131) & (0.033) & (0.020) & (0.171) \\ 
  & & & & & & & \\ 
\hline \\[-1.8ex]  \\[-1.8ex] 
Observations & 21,612 & 21,605 & 21,549 & 18,356 & 21,616 & 21,653 & 21,527 \\ 
R$^{2}$ & 0.539 & 0.824 & 0.347 & 0.410 & 0.399 & 0.669 & 0.615 \\ 
